Hardware Knowledge Base: "Thread Tap"

Definition: Standard tool for machining cylindrical and conical internal threads.

A tool for machining internal threads with grooves in the axial direction. Also called tapping. The tap is divided into a straight slot tap, a spiral slot tap, and a screw tap tap depending on its shape. Straight groove taps are easy to process, with slightly lower accuracy and larger output. Generally used for general lathes, drills, and tapping machines, the cutting speed is slow. Spiral groove taps are mostly used for drilling blind holes in CNC machining centers. The machining speed is high, the precision is high, the chip evacuation is good, and the neutrality is good. The screw tap has a receiving slot in the front to process the through hole. Most of the taps provided by the current tool factory are coated taps, which greatly improve the service life and cutting performance of uncoated taps.

Machine and hand taps are standard taps that cut ordinary threads. China has traditionally referred to high-precision high-speed steel molar taps as machine taps and carbon tool steel or alloy tool steel hobbing (or incisor) taps as hand taps. In fact, the structure of the two are known as hand taps. The working principle is basically the same. In general, the tap consists of a working portion and a shank. The working part is divided into the cutting part and the calibration part. The former wears a cutting cone and takes on the cutting work. The latter uses the size and shape of the thread.

Uses: For processing of common internal threads (ie tapping) on ​​nuts or other mechanical parts. Machine taps are usually high-speed steel molar taps for tapping on machine tools; hand taps are carbon tool steels or Alloy tool steel rolling (or incisor) taps for manual tapping.

The tap is a cutter for machining all kinds of medium and small-sized internal threads. It has a simple structure and is easy to use. It can be operated manually or on a machine tool. It is widely used in production.

For small internal threads, the wire dimension is almost the only machining tool. Siwei's types include hand silk, machine taps, nut taps, and extrusion taps.

Features

Taps are usually single or grouped. Small and medium size through-hole threads can be tapped with a single tap. When a blind hole or a large-sized screw hole is processed, a group of taps is often used, that is, one screw hole is processed in turn using two or more taps. Grouped taps are of equal diameter and unequal diameter. Taps of equal diameter design, each branch only has different lengths of cutting cones; Taps of unequal diameter design, each thread size is not the same, only the last one has a complete tooth shape. The tapping load of the tapped design is reasonable and the processing quality is high, but the manufacturing cost is also high. Trapezoidal thread taps are often designed with unequal diameters.

New structure

In order to improve the cutting efficiency of the tap, to improve the chip and chip removal conditions and to reduce the breakage and breakage, modern taps have a variety of new structures. 1 Tapped Tap: The cutting part is ground with a chute, forming a negative blade angle (see tool). The chips are discharged forward during cutting and are suitable for machining through holes. 2 spiral groove taps: chip flutes spiral, in the processing of blind hole right-handed thread, the tap to make the right spiral chip flutes, so that the chips discharged, do not scratch the thread. 3 Slotless extrusion tap: The plastic deformation of metal is formed by extruding the hole wall. It is mainly used to process aluminum alloy, copper and other plastic materials, and also can process low carbon steel and stainless steel. The tap cone at the front of the tap is a tapered thread. In order to reduce the friction and reduce the extrusion force, the tap section is made into a polygon. Extrusion taps have a high strength and are particularly suitable for machining small diameter screw holes up to 6 mm in diameter. 4 Tooth taps: grinding one tooth in the direction of the helix of the cutter tooth, thus increasing the thickness of the chip, which is helpful for chip breaking and chip removal. It is used to process stainless steel and other workpieces. 5 Draining chip taps: The chips are discharged from the inner hole of the tap and are used to process large size screw holes. 6 Automatically shrink the tap: After tapping, the tap teeth can be automatically retracted inwards for quick exit. 7 broaching tap: It is a broach with knife teeth distributed on the helix. It is often used for machining trapezoidal and square thread. 8 Carbide Taps: Mainly used for machining cast iron and non-ferrous metals, with high cutting efficiency and tool life.

Tap classification

Extruding tap

Extrusion tap is a new type of thread cutting tool that uses the principle of metal plastic deformation to process internal thread. Extrusion tap extrusion internal thread is a chipless processing technology, especially suitable for copper alloys and aluminum alloys with low strength and good plasticity. Can also be used for stainless steel and low carbon steel and other low hardness, plastic material tapping, long life. The surface of the thread extruded with the extrusion tap has a high degree of smoothness, the metal fiber of the thread does not break, and a chill layer is formed on the surface, which can improve the strength and wear resistance of the thread. It fundamentally solves the problem of tapping chipping difficulties, because there is no debris, more conducive to the assembly of the thread.

Multipurpose Tap Rotator

A multi-purpose screw driver for tapping internal threads and an alternative screwdriver, including a chuck portion, a transmission portion, and a shift portion of a clamping tap or other tool head, which controls shifting of the blade to achieve shifting. The utility model can make the multi-purpose spinner rotate clockwise and reversibly, and the sleeve does not move together, and operates continuously without interruption. Therefore, it not only has good stability and high work efficiency, but also has a wide range of use and can work at any working point.